Major Air Pollutants and Their Effects

Air pollution is the introduction of chemical, particulate matter or biological materials that cause harm or discomfort to humans or other living organisms, or damages the natural environment, into the atmosphere. The atmosphere is the thin layer of gases that surrounds the earth surfaces. Recently, environmental problems have been local and minor because of the earth's own ability to absorb and purify minor quantities of pollutants. The industrialization, introduction of more number of vehicles, and the explosion of the population, are contributing toward the growing air pollution problem. Knowing of major air pollutants and their effects are very important to global world

N,N'Bis(2-chloro-phen-yl)-4-(4-chloro-phen-yl)-2,6-dimeth-yl-1,4-dihydro-pyridine-3,5-dicarboxamide

In the title compound, Csb 27Hsb 22Clsb 3Nsb 3Osb 2, the dihydro-pyridine ring has a boat conformation. The mol-ecules are linked by N-H⋅sO, N-H⋅sCl, C-H⋅sN and C-H⋅sO hydrogen bonds

Methyl 2-(benzoyloxy)benzoate

In the title compound, C15H12O4, the dihedral angle between the two aryl rings is 68.19 (9)°. In the crystal, molecules are linked by C—H...π interactions forming chains along the b-axis direction. The chains are linked by offset π–π interactions [intercentroid distance = 3.6806 (14) Å], forming sheets lying parallel to (10-1)

Crystal Structure of 12-Methoxy-8,8,21,21-tetramethyl-5-(3-methylbut-2,4-dienyl)-19-(3-methylpent-4-enyl)-3,7,20-trioxahexacyclo 15.4.1.0<2,15>.0<2,19>.0<4,13>.0<6,11>docosa-4(13),5,9,11,15-pentaene-14,18-dione

The title compound was extracted from the natural product of plant origin. It crystallizes in tetragonal space group P4(1) or P4(3), with cell parameters a = 15.795(2)Angstrom, c = 11.970(5)Angstrom and Z = 4. The structure exhibits intermolecular hydrogen bonds of the type C-H...O

(3-Chloro-phen-yl)(2-hydr-oxy-5-methyl-phen-yl)methanone

In the title compound, Csb 15Hsb 14ClOsb 2, the dihedral angle between the two benzene rings is 57.37(12)circ

Crystal structure of the 4-chromanone derivative

The title compound was extracted from a natural product and its structure was characterized by an X-ray diffraction method. It crystallizes in the tetragonal space group P4(1) with cell parameters a = 15.832(10)Angstrom, c = 11.622(10)Angstrom, Z = 4; the final residual factor is R-1 = 0.0769. The structure has both intra and intermolecular hydrogen bonds

Samarium coordinated polymer: Structural, vibrational and thermal studies of Sm-2(C3H2O4)(3)(H2O)(6)](n)

The title compound, Sm-2(C3H2O4)(3)(H2O)(6)](,) was investigated by X-ray diffraction. It crystallizes in the monoclinic space group C2/c with cell parameters a = 17.1650(8) , b = 12.3010(5) , c = 11.1420(4) , beta = 127.5161(10)A degrees, Z = 4 and V = 1866.04(14) (3). The Sm atom lies on a two-fold axis and has nine-coordination with six oxygen atoms from carboxylate groups and three water molecules. The compound forms a layer-type polymeric structure. The layers are formed by samarium and one independent malonate group to give a three-dimensional framework. The extensive network of hydrogen bonds and bridge bonds observed in this structure enhances the structural stability. The thermal dehydration of the compound was investigated by thermogravimetric analysis

Synthesis of pharmaceutically important condensed heterocyclic 4,6-disubstituted-1,2,4-triazolo-1,3,4-thiadiazole derivatives as antimicrobials

The two series of 4,6-disubstituted 1,2,4-triazolo-1,3,4-thiadiazole derivatives 2(a–e) and 3(a–e) were synthesized and characterized using IR, 1H-NMR, CHNS analysis and by single crystal X-ray crystallographic studies. The compound 6-(2-chloro-phenyl)-3-ethyl-1,2,4triazole3,4-bthiadiazole 2b has been characterized by single crystal X-ray diffraction method. The compound crystallizes in monoclinic space group P21/c with a cell parameters a=11.879(1) Å, b=15.112(2) Å, c=13.95(2) Å, Z=8 and the final R factor is R1=0.0524. The structure exhibits both intra and intermolecular hydrogen bonds. The title compounds were checked for their efficacy as antimicrobials in vitro. Compounds 2b, 2c, 2d, 3b, 3c and 3d showed significant inhibition against all the strains tested, when compared to standard drugs

Synthesis and X-ray crystal structure studies of 1-ethyl-3-(2-chlorophenyl)-1,2,3-triazolium perchlorate

The isolation of stable carbenes of the Arduengo (1a) and Wanzlick (2a) type has prompted us to look for stable nitrenium ions of the related structural type 1-ethyl-3-(2-chloropenyl)-1,2,3-triazolium perchlorate (6(+)ClO(4)(-)). The title compound was synthesized and the structure was investigated by X-ray crystallography. It crystallizes in the monoclinic space group P2(1)/n with cell parameters a = 7.066(4) Angstrom, b = 27.680(6) Angstrom c = 7.486(2) Angstrom, beta = 111.22(3)degrees, and Z = 4. The structure exhibits arrangement of the molecules with intermolecular layers

Synthesis and X-ray crystal structure study of 2-methyl-4-(2-methylbenzoyl)-phenoxy] acetic acid hydrazide

Benzophenone analog 3 has been synthesized and characterized by the X-ray diffraction (XRD) method. The compound crystallizes in a monoclinic space group P2(1)/c with cell parameters a = 7.701(8) Angstrom, b = 7.151(5) Angstrom, c = 28.323(3) Angstrom, beta = 104.639(4) degrees, Z = 4. The structure exhibits intra- and intermolecular hydrogen bonding of the type N-H...O, C-H...O, and N-H...N. The molecules are interlinked through hydrogen bonds forming an infinite chain. This polymeric-like structure may play an important role in biological activity